Warmer water at 40C is:
Correct answer: D. Heaviest
- A. Lighter
- B. Highest
- C. Heavier
- D. Heaviest
Explanation
Water has the highest density at 4 degree C as the cage-like structure which forms when water freezes starts breaking. Volume decreases hence water becomes more dense or heavier.
This question appeared on the ETEA MDCAT 2008 paper, which you can sit online with every answer explained.
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About Anomalous Behaviour of Water
Water expands when cooled below 4°C and when it freezes, giving liquid water its maximum density at 4°C. The explanation depends on hydrogen bonding and the open structure of ice, which makes ice less dense than water and allows it to float.
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